Superheater for boilers of the locomotive type.



W. SCHMIDT.

APPLIUATION FILED 213.27. 1909.l

Patented May 18, 1909.

2 SHEETS-SHEET 1.

ATTORNEYS SUPERHBATER FOR BOILBRS 0F THE LoGoMoTIvE THB.

W. SCHMIDT. K SUBBRHBATER FOR BOILERS OF THE LOCOMOTIVE TYPE.

APPLICATION FILED FEB. 27. 1909.

Patented May 1S, 1909.

2 SHEETS-SHEET 2.

@nu M W/TNESSES shown as examples, several embodiments of fl im@ en' WILHELM SCHMIDT, OF WILHELMSHHE, NEAR CASSEL, GERMANY.

S''ERHEATER FOR BO-ILERS 0F THE LOCOMOTIVE TY'PE.

no. season,

original application ed December 1D, 1908, Serial No. 466,742. Divided and this application. fried 'February 27,

rammed .tray is, ieee.

99. Serial No. $30,416.

superbe aters in which the superheating tubes were arranged within some of the smoke tubes in boilers of' the locomotive type. has also been proposed to arrange super'- heaters in the iire-box of such boilers but in all constructions previously suggested where the whole or a part of the super-heating surface was arranged in the i-re box, di'llculties have been met with, which it is the object of the presentinvention to overcome.

The following specific ends have been sought for in the present invention. i, preventing burning of the tube and tube joints during operation or when no steam 1s b'emgr used 2, arranging the superheater so that it does not occupy too much space (ir-interfere with the efficiency of' the boiler; 3, providing for easy renewal, repairingv and cleaning of the parts and 4.-, avoiding excessive weight. The above features must be embodied in one structure if full success is to be obtained.

The object of the present invention therefore, as stated above, is to provide an imrov'ed construction of nre box superheater which shall incorporate the above mentioned features.

In the accompanying dran/'ings l: have my invention, according to which the superheater cons1sts of straight superheating tubes extending from the smoke-box through en- I l larged smoke tubes to the fire box and thence through hollow sta f-bolts or thimbles in the rear wall ofthe boi er. The scope ol my invention is deiined in the appendedclaims.

l prefer that those sections of thel superheatertubes which are actually in the fire box and therefore exposed to the greatestheat shall have a greater wall thickness than the sections of said tubes which lie within the ecember 10, 1908, of whichv smoke tubes; preferably, also, l cause the superheater tubes to pass eccentrically through the smoke tubes so as to lie, is' shown by the drawings, closer to the upper wall of said smoke tubes than to the lower. Below the superheating tubes in the Alire box a lire proof cross wall is arranged forming a superheating chamber in the upper partof the lire box, the object being to protect the tubes against the direct action of the lire and also to guide and regulate the flow ofthe fire gases along them, these gases entering by openings in thc cross wall near the rear wall of the boiler. By sloping or lowering the cross wall so that it incluses not only the enlarged smoke tubes but also a number of ordinary tubes, the amount of gases passing through the superheater chamber and thus the e'liciency of the superheating surface in the chamber formed in the upper part of the lire box can be increased. ln this Wayl ob tain a very elli cient action of the heating surlace within the chamber so that a high degree of superlieat may be obtained with a superheater of comparatively small weight and bulk.

rzmne smoke box ends of the smoke tubes arranged above the cross wall may be inclosed by a Casing provided with a damper, by thel regulation of which any desired quantity ol gases from zero Upward may be passed through the superheater chamber and a corresponding degreev ol y superheat' obtained. Opposite the passage or passages in the cross wall protecting means for the superheater parts may be arranged.

Referring to the drawings, lligure 1 is a longitudinal section through a locomotive boiler provided with a superheater accord- .ing to my invention.; Fig. is partly an eX- ternal end View and partly a-sectionv on the line .9k-Z of lig l; Fig. 3 is an enlarged sectional detail sho the arrangement of. the" superheater tubes as they pass through the back' of the boiler; l is a similarly enlarged detail showing the superheater tubes, super-heated steam header', and'outlet pipe at theA front ot the boiler; while Figs. 5 and 6 show a mooilication oiimy inventionin which the steam is give .but one pass through the length of the .r and this in the saine din rection as the urneee gases.

Referring to Figs. 'l to 4 three en larged smoke tubos d and three rows of superheater tubes c, c and .c' are employed; and the latter are so arranged as to give the smoke box in front.

l departingfrom the' spirit of my invention .'tubes, c2, can ybereadily extracted for rey arranged within t e smoke box.

which said pipesare passed. This wall is. .formed of transverse water pipes r` expanded .middle row c and the lower row c can be accessibility for cleaning and repairing is obsteam three passes through the entire length ofthe boiler. This is accomplished byintroducing saturated steam at b at the back end of the boiler, the steam then passing through the lowest row of tubes c to the smoke box end of the boiler where a bend 13 is provided to connect each tube of this lowest `row' with .a corresponding tube of lthe middle row c. At the back end of the boiler themiddle row c is connected to the u per row c2 by a connection as shown in igs. 1 and 2 and in enlarge detail in Fig. 3. The superheating tubes c2 in the top row are connected at their front ends withl the su erheated steam header From this header y" pipes 7c lead the superheated steam to the engine. y

In the iire box there is a protecting wall g placed just below the superheater pipes and inclosing the enlarged smoke tubes 4through into the side walls s of the furnace and arranged at convenient distances apart; on these water tubes are placed lre bricks u cut away at their lower bottom corners so as to fit between adjacent pairs of tubes. At the rear of this protecting wall is a passage w provided with aprotecting lip 19 which is supported by means of transverse water tu es 20 whereb direct action of the iiame Through this passage the furnace gases-are drawn into the up er part of the fire box so as to pass over-t at portion of the 'superheater tubes l ing therein, and thence through the en arged smoke tubes to the This rotecting Wall g is shown as inclosing on y the enlarge( smoke tubes through which pass the superheater tubes, but I may, of course, without causethis protecting wall to'-b`e differently located or differently sloped 'so as to include any desired proportion of such remaining smoke tubes as may not contain. superheater tubes.

In the smoke box I have provided a casing y containing a damperxjf this casing should, of course, inclosesuch'of the'enlarged smoke tubes as are inclosed by the protecting wall at the fire box end.

It will be `seen that the uppermost row of pairs atthe rear end of the boiler while the extracted at the smoke box end after/they have -been cut of at -their rear ends, so that tained by this construction.

According to the form `ol" my invention illustrated in Figs. 5 and 6', the steam'is given only one pass throughthe length of the boiler, andl for this purpose the superheater tubes all connect at the back end of the boiler, with a saturated steam header, bf, .and at the front or smoke box end of'v the boiler with a superheated steam header, i2, from whence the steam passes to the en 'ne by outlet pipe lf2. In'thiscase it wil be seen that the steam asses through the superheater tubes, c, in t e same direction as the furnace gases; otherwise the construction illustra-ted in Figs. 5 and 6 is substantiall the same as that already described wit reference to Figs. land 4.

I claim as my invention: 1. In a steam superheater, for use Witha locomotive boiler provided with three rows' of enlarged smoke tubes in the uppe lpart'80 thereof, the combinationfof superheater tubes extending from thesmoke box'of the.A boiler through' the lowest row of, said4 er1- larged smoke tubesand fire box and through the back wall of the boiler, a saturated steam header at said back wall connected to said superheater` tubes, a second set of simiv larly disposed su erheater tubes passing V through the midd e row of fsaid enlarged smoke tubes, an end connection in the smoke box for said superheater tubes, a third set of similarly disposed superheater tubes passing through the top row of said enlarged smoke tubes, .an end connection at the back wall of the boiler between the two upper sets of superheater tubes, and a superheated steam header in the smoke box connected with said third set of, superheater tubes, substantiall as and for the purpose described.`

2. In a steamsuperheatenfor use with a locomotive b oiler provided with three rows of enlarged smoke tubes in the upper part thereof, the combination of 'superheater- 4 tubes extending from the smoke box of the boiler through the lowest rowl of'said enlarged smoke tubes and iire box and throughy the back wall of the boiler, a saturated steam header at said back wall connected to said, superheater tubes, 'a second set of similarly disposed superheater tubes passing throughthe middle row of said enlarged smoke tubes, an end connection 4in the smoke box for said superheater tubes, a third'set of similarly; .disposed superheater tubes passing throug the top row of saidenlarged smoke tubes', an 1 15 end connection at the back wall of the boiler i Vbetween thev two upper sets of superheater tubes, a superheated steam header inthe smoke box 'connected with said third set of' superheaterv tubes, and a protecting crosswall for said superheaterin the upper part of' the re box saidcross wall comprising water tubes and having apassage for the fire gases; substantially as and: for the purp'oseidescribed. 125 3. In ya s'team superheater., for use with'a, locomotive boiler provided with three-rows of `enlarged smoke tubes in the upper-part# thereof, the combination o superheater tubes extending fromthe'smoke box of the' 130 zov . hetween the two upper sets ioiln through the lowest row of said en iaiged smoke tubes and fire box and through the heel; wallet the boiler, a saturated steam header at said back wall connected to said superheeter tubes, a second set of similarly dieposed heater tubes passing through the middle row of said enlarged smoke tubes, an end connection in the snioke box for :said snperheater tubes, a third set of similarly disposed superheater tubes passing thiough the top rowv of end connection at the back wall orthe hoiler of snperheater tubes, a superheated steam smoke box connected with said third set of superheeter tubes, a protecting cross-well provided with a assage or passages for furnace gases and e off said three rows of enlarged'smoke tubes in the i re box, a Casing in the smoke box inolosing said enlarged smoke tubes, and a damper on said casing,r for regulating the Alow of fire gases drawn over Asaid protecting cross well and through said inolosed smoke tuhes, substantially and for the purpose described. l

4. ln a steam superheater, for use with a locomotive boiler provided with three rows ol enlarged smoke tubes in the upper part thereof, the ooiuhination or superheater tubes extending; from the smoke box of the holler tlzrovfrh 'd enlarged smoke tubes and. through the back 'wall of the lire hor; boiler, a'satureed steam header at said4 back weil conneoted to said superheater tubes, a surerheated stoom header 1n the smoke box said enlarged smoke tubes, an

header in the' l connected with said superheater tuiles, and

va protecting oross Wall provided. with a passage or passages for hirnacev gases closing ed' a determined nurnher of said upper smoke tubes in the fire box, substantially as and for the purpose described.

5, In a steam superheater, for use with a locomotive boiler provided with three rows; of enlarged smoke tubos in the upper part thereof, the combination of superheator tubes extending from 'the smoke hox o tl i holler th rough said enlarged srhoke tuhes a xd tire box and through the back wall of the boiler, a saturated steam header at said haul;

Wall connected. to said superhoater tubes, r

su'perheated steam header in the smoke box connected with said superheater tubes, a proteotinu,V cross wall provided with a passage or passages for furnace gases and closing oV` a determined number of upper smoke tubes in the fire box, a easing in the sniolce hoX inclosing said determini-d number of inolosed smoke tubos, and a darn )er on said casing for regulating the flow of 1ro gases drawn over said protecting eroswwall and through said inclosed smoke tubes, substantially and for;I the purpose described.

ln witness whereof .l have hereunto set .any hand inthe presence of two subscribing witnesses.

J'ULIUs 'FRAN KE MARTrN Son Murr. 

